We look at the division of 72579166 by 86 
The aim is to understand the frequency of 86 in 72579166.

Going ahead to step 1:
If we divide 7 by 86, we get 0 and a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Bring next digit (2) of the dividend behind the 7 and repeat the process: 72 / 86

Advancing to step 2:
The number 86 fits into 72 0 times, leaving a remainder of 72.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 72, we end up with 72.
Fetch the next digit (5) from the dividend, attach it to 72 and continue: 725 / 86

Step 3:
If we divide 725 by 86, we get 8 and a remainder of 37.
Write down 8 as next digit of the result. 
Result so far: 8.0
Subtracting 688 from 725 leaves us with 37.
Bring next digit (7) of the dividend behind the 37 and repeat the process: 377 / 86

On to step 4:
377 divided by 86 is 4 with a remainder of 33.
The next digit of our result is 4. 
Result so far: 84.0
Subtract 344 from 377 to get 33.
Append the next digit (9) from the dividend to 33 and continue with: 339 / 86

Advancing to step 5:
86 goes into 339 3 times with a remainder of 81.
Put 3 as the next digit of the answer. 
Result so far: 843.0
If we subtract 258 from 339, we get 81.
Include the next digit (1) from the dividend after 81, then repeat: 811 / 86

Step 6:
811 divided by 86 is 9 with a remainder of 37.
The next digit of our result is 9. 
Result so far: 8439.0
The remainder is 37 after subtracting 774 from 811.
Fetch the next digit (6) from the dividend, attach it to 37 and continue: 376 / 86

Let's proceed to step 7:
86 can be fit into 376 4 times, resulting in a remainder of 32.
The next digit of our result is 4. 
Result so far: 84394.0
The remainder is 32 after subtracting 344 from 376.
Bring next digit (6) of the dividend behind the 32 and repeat the process: 326 / 86

Going ahead to step 8:
86 goes into 326 3 times with a remainder of 68.
The number 3 becomes the next digit in our result. 
Result so far: 843943.0
If we subtract 258 from 326, we get 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

On to step 9:
When dividing 680 by 86, we get 7 with a remainder of 78.
Put 7 as the next digit of the answer. 
Result so far: 843943.7
Subtracting 602 from 680 leaves us with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

On to step 10:
The number 86 fits into 780 9 times, leaving a remainder of 6.
Put 9 as the next digit of the answer. 
Result so far: 843943.79
Subtract 774 from 780 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 11:
60 divided by 86 is 0 with a remainder of 60.
The next digit of our result is 0. 
Result so far: 843943.79
Deduct 0 from 60 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 12:
The number 86 fits into 600 6 times, leaving a remainder of 84.
Use 6 as the next digit of our solution. 
Result so far: 843943.7906
If we take 516 away from 600, we end up with 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Step 13:
86 goes into 840 9 times with a remainder of 66.
The number 9 becomes the next digit in our result. 
Result so far: 843943.79069
Subtracting 774 from 840 leaves us with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Advancing to step 14:
The number 86 fits into 660 7 times, leaving a remainder of 58.
Write down 7 as next digit of the result. 
Result so far: 843943.790697
If we subtract 602 from 660, we get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

On to step 15:
When dividing 580 by 86, we get 6 with a remainder of 64.
Record the quotient 6 as the next digit in the result. 
Result so far: 843943.7906976
The remainder is 64 after subtracting 516 from 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Moving on to step 16:
The number 86 fits into 640 7 times, leaving a remainder of 38.
Write down 7 as next digit of the result. 
Result so far: 843943.79069767
The remainder is 38 after subtracting 602 from 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

After the division, we end up with 843943.79069767 and a remainder of 3.8e-08.